:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --accent: #3b82f6;
  --accent-glow: #60a5fa;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --border: #475569;
  --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  --google-red: #DB4437;
  --facebook-blue: #4267B2;
  --twitter-blue: #1DA1F2;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --accent: #3b82f6;
  --accent-glow: #2563eb;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --border: #e2e8f0;
  --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* Password Strength Indicator */
.password-strength {
  margin-top: 8px;
}

.strength-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.strength-fill {
  height: 100%;
  border-radius: 3px;
  transition: all 0.3s ease;
  width: 0%;
}

.strength-fill.weak {
  background: var(--danger);
}

.strength-fill.medium {
  background: var(--warning);
}

.strength-fill.strong {
  background: var(--success);
}

.strength-fill.very-strong {
  background: var(--accent);
}

.strength-text {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.strength-text:has(+ .strength-fill.weak) {
  color: var(--danger);
}

.strength-text:has(+ .strength-fill.medium) {
  color: var(--warning);
}

.strength-text:has(+ .strength-fill.strong) {
  color: var(--success);
}

.strength-text:has(+ .strength-fill.very-strong) {
  color: var(--accent);
}

.strength-feedback {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.strength-feedback li {
  margin-bottom: 2px;
}

.strength-feedback li::before {
  content: '• ';
  color: var(--danger);
}

/* Checkbox Styles */
.checkbox-group {
  margin: 16px 0;
}

.checkbox-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  user-select: none;
}

.checkbox-input {
  display: none;
}

.checkbox-custom {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border);
  border-radius: 4px;
  margin-right: 8px;
  position: relative;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.checkbox-input:checked + .checkbox-custom {
  background: var(--accent);
  border-color: var(--accent);
}

.checkbox-input:checked + .checkbox-custom::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.checkbox-text {
  flex: 1;
}

.checkbox-label:hover .checkbox-custom {
  border-color: var(--accent);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.auth-body {
  font-family: 'Inter', 'Noto Sans Bengali', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  padding: 20px;
}

.auth-container {
  width: 100%;
  max-width: 400px;
}

.auth-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 30px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.auth-header {
  text-align: center;
  margin-bottom: 15px;
}

.auth-icon {
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 15px;
}

.auth-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-glow) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-input {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 12px 15px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.auth-btn {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 10px;
}

.auth-btn:hover {
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.divider {
  display: flex;
  align-items: center;
  margin: 20px 0;
  color: var(--text-secondary);
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.divider-text {
  padding: 0 15px;
  font-size: 0.9rem;
}

.social-auth {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.social-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.google-btn {
  border-color: var(--google-red);
  color: var(--google-red);
}

.facebook-btn {
  border-color: var(--facebook-blue);
  color: var(--facebook-blue);
}

.twitter-btn {
  border-color: var(--twitter-blue);
  color: var(--twitter-blue);
}

.auth-links {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.auth-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.auth-link:hover {
  text-decoration: underline;
}

.guest-option {
  text-align: center;
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.guest-btn {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text-secondary);
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.guest-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Auth Message Styles */
.auth-message {
  padding: 12px 15px;
  border-radius: 8px;
  margin: 15px 0;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 500;
  display: none;
  transition: all 0.3s ease;
}

.auth-message.success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
  display: block;
}

.auth-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid var(--danger);
  display: block;
}

/* Enhanced Form Labels */
.form-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.form-label i {
  color: var(--accent);
  width: 16px;
}

/* Enhanced Auth Button */
.auth-btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-glow) 100%);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 50px;
}

.auth-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.auth-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.auth-btn.secondary {
  background: transparent;
  border: 2px solid var(--border);
  color: var(--text-secondary);
}

.auth-btn.secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
}

/* Enhanced Auth Links */
.auth-links {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.auth-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.auth-link:hover {
  text-decoration: none;
  color: var(--accent-glow);
  transform: translateX(2px);
}

/* Password Reset Info Section */
.password-reset-info {
  margin-top: 25px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.info-section {
  margin-bottom: 20px;
}

.info-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.info-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.info-list li i {
  color: var(--success);
  font-size: 0.9rem;
  width: 16px;
}

.help-section {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 8px;
  padding: 12px;
}

.help-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.help-text i {
  color: var(--accent);
  margin-top: 2px;
  flex-shrink: 0;
}

/* Success State */
.success-state {
  text-align: center;
  padding: 20px;
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 12px;
  margin-top: 20px;
}

.success-icon {
  font-size: 3rem;
  color: var(--success);
  margin-bottom: 15px;
}

.success-state h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.success-state p {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.success-state strong {
  color: var(--accent);
  font-weight: 600;
  display: block;
  margin-bottom: 20px;
  padding: 8px 12px;
  background: rgba(59, 130, 246, 0.1);
  border-radius: 6px;
  font-family: monospace;
}

.success-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

/* Enhanced Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.1);
}

.theme-toggle i {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.theme-toggle:hover i {
  transform: rotate(180deg);
}

/* Improved Responsive Design */
@media (max-width: 480px) {
  .auth-container {
    padding: 10px;
  }
  
  .auth-card {
    padding: 25px 20px;
    margin: 10px 0;
  }
  
  .auth-title {
    font-size: 1.5rem;
  }
  
  .auth-icon {
    font-size: 2.5rem;
  }
  
  .auth-links {
    flex-direction: column;
    text-align: center;
  }
  
  .success-actions {
    flex-direction: column;
  }
  
  .theme-toggle {
    top: 15px;
    right: 15px;
    width: 45px;
    height: 45px;
  }
}

/* Animation for loading states */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.fa-spin {
  animation: spin 1s linear infinite;
}

/* Enhanced focus states for accessibility */
.form-input:focus,
.auth-btn:focus,
.auth-link:focus,
.theme-toggle:focus {
  outline: 3px solid rgba(59, 130, 246, 0.3);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  .auth-card {
    padding: 20px;
  }
  
  .auth-title {
    font-size: 1.5rem;
  }
  
  .auth-icon {
    font-size: 2.5rem;
  }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid #fff;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}